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Spherical Nanoindentation Stress-Strain Analysis of Ion-Irradiated Tungsten

  • Siddhartha PathakEmail author
  • Jordan S. Weaver
  • Cheng Sun
  • Yongqiang Wang
  • Surya R. Kalidindi
  • Nathan A. Mara
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

This paper discusses applications of spherical nanoindentation stress-strain curves in characterizing the local mechanical behavior of materials with modified surfaces. Using ion-irradiated tungsten as a specific example, this paper demonstrates that a simple variation of the indenter size (radius) can identify the depth of the radiation-induced-damage zone, as well as quantify the behavior of the damaged zone itself. Using corresponding local structure information from electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) we look at (a) the elastic response, elasto-plastic transition, and onset of plasticity in ion-irradiated tungsten, zirconium and 304 stainless steel under indentation, and compare their relative mechanical behavior to the unirradiated state, (b) correlating these changes to the different grain orientations as a function of (c) irradiation from different sources (such as He, W, and He+W for tungsten samples).

Keywords

Nanoindentation stress-strain Radiation damage gradient Stress saturation Electron back-scattered diffraction Transmission electron microscopy 

Notes

Acknowledgements

The authors acknowledge funding from Department of Energy, Nuclear Engineering Enabling Technologies (DOE-NEET)—Reactor Materials program # DE-FOA-0000799, and University of California Office of the President (UCOP) under Award Number 12—LR237801 for this work. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the U.S. Department of Energy under contract DE-AC52-06NA25396. SP gratefully acknowledges funding from the Los Alamos National Laboratory Director’s Postdoctoral Fellowship and University of Nevada, Reno start-up faculty funds for this work.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Siddhartha Pathak
    • 1
    Email author
  • Jordan S. Weaver
    • 2
  • Cheng Sun
    • 3
  • Yongqiang Wang
    • 3
  • Surya R. Kalidindi
    • 4
  • Nathan A. Mara
    • 3
    • 2
  1. 1.Chemical and Materials EngineeringUniversity of NevadaRenoUSA
  2. 2.Los Alamos National LaboratoryCenter for Integrated NanotechnologiesLos AlamosUSA
  3. 3.Materials Science and Technology DivisionLos Alamos National LaboratoryLos AlamosUSA
  4. 4.George W. Woodruff School of Mechanical EngineeringGeorgia Institute of TechnologyAtlantaUSA

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